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<h1 class="topictitle1">生产环境异步IO请求数达到最大值，导致备份失败</h1>
<div><div class="section"><h4 class="sectiontitle">现象描述</h4><p>备份任务失败，在任务界面可查到如下图的事件失败描述。</p>
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<div class="section"><h4 class="sectiontitle">可能原因</h4><p>生产环境异步IO请求数达到最大值，导致备份失败。</p>
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<div class="section"><h4 class="sectiontitle">处理步骤</h4><ol><li><span>登录生产环境，执行<strong>vi /etc/sysctl.conf</strong>命令，在编辑模式查看“fs.aio-max-nr”参数的值。</span></li><li><span>根据以下场景确认问题产生原因：</span><p><ul><li>当“fs.aio-max-nr”参数异常（如参数值小于参考值或该参数不存在等）时，需要根据<a href="https://help.sap.com/docs/SAP_HANA_PLATFORM/6b94445c94ae495c83a19646e7c3fd56/82e4575eec664846a9918e9ed1d90d41.html" target="_blank" rel="noopener noreferrer">Linux Kernel Parameters</a>的参数对应参考值（18446744073709551615）重新设置该参数，设置完成后执行<a href="#SAP_HANA_0109__li265812449712">3</a>。</li><li>当“fs.aio-max-nr”参数存在且参数值正常时（参数值参考<a href="https://help.sap.com/docs/SAP_HANA_PLATFORM/6b94445c94ae495c83a19646e7c3fd56/82e4575eec664846a9918e9ed1d90d41.html" target="_blank" rel="noopener noreferrer">Linux Kernel Parameters</a>中对应的值），请收集日志并联系华为技术支持工程师协助处理。</li></ul>
</p></li><li id="SAP_HANA_0109__li265812449712"><a name="SAP_HANA_0109__li265812449712"></a><a name="li265812449712"></a><span>执行<strong>sysctl -p /etc/sysctl.conf</strong>命令，使配置生效，命令执行完成后重新执行备份。</span></li></ol>
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